Note 9 - Commitments and Contingencies (Tables)

6 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

201 8		521,000
2019		359,000
2020		123,000
Total	$	1,003,000

Schedule of Product Warranty Liability [Table Text Block]

	Six Months Ended December 31,			Years E nded June 30,
	2017			2017			2016
Beginning balance	$	588,000		$	566,000		$	627,000
Warranties issued during the period		95,000			120,000			97,000
Settlements made during the period		(359,000	)		(93,000	)		(287,000	)
Changes in liability for p re-existing warranties during the period		(33,000	)		(5,000	)		129,000
Ending balance	$	291,000		$	588,000		$	566,000